In the hours before Saturday's pivotal Republican presidential debate in Iowa, attention has been riveted on the intensifying battle between front-runners Mitt Romney and Newt Gingrich.

Waiting in the wings, with hope and a prayer — directed squarely at the state's evangelical voters — is, improbably, Texas Gov. Rick Perry.

While nations wrangle over a new global treaty on climate change, the question on many minds is: What happens next?

Key portions of the Kyoto Protocol are set to expire at the end of 2012. But many of the world's major greenhouse gas emitters have already set national targets to reduce emissions, and they're forging their own initiatives to meet those goals.

To become a cab driver in London, you have to acquire "The Knowledge," which is their fancy way of saying that you have to memorize all the streets in London. It's quite a process that takes most three to four years to complete.

Now, scientists have found that studying for the test makes your brain bigger. The U.K. Press Association reports:

Cookie dough may be one of the joys of the holiday season, but it's dangerous, at least for people who nibble it raw.

What's it like to perform with a ghost?

"There was no pianist breathing or cueing me," cellist Zuill Bailey says. "The good news is that he was very consistent." Soprano Isabel Bayrakdarian adds, "It's absolutely true — it takes a little bit of adjusting."

Bailey and Bayrakdarian are talking about their accompanist: the late — very late — Manuel de Falla, who died in 1946. With the help of new recording technology, the two have performed de Falla's Seven Popular Spanish Songs for a new release, The Spanish Masters.

Back in the 1930s, Boyd Lee Dunlop taught himself to play music on a broken piano left out on the streets of Buffalo, N.Y. Only half the keys worked.

He also taught his little brother Frank to play the drums while they were growing up. Frankie Dunlop went on to record with Thelonious Monk and Charles Mingus, among other jazz greats. Boyd Lee Dunlop went to work in the steel mills and rail yards of Buffalo, occasionally playing piano at local clubs.